Paste event blocks change event

[Mark Wade]

Steps to reproduce ¶

1. Create a plugin with the following code and add it to your editor:

CKEDITOR.plugins.add( 'myplugin', {
    init: function( editor ) {
	    editor.on( 'change', function(e) {
			console.log('change');
		});
	}
});

2. Hit any key and observe that the message "change" is logged to the console.

3. Paste something - "change" will be logged" - then hit any key, and it will not be logged. If you hit another key after that, it is logged again.

Expected result ¶

"change" should always be logged when a key is pressed.

Actual result ¶

"change" is not logged immediately after a paste.

Other details (browser, OS, CKEditor version, installed plugins) ¶

Seems to only affect Chrome.

[Jakub Ś]

DUP of #13763.